Paragraf Tamamlama 12. Soru

Bu Testin Birincisi Bengu

Başarı Yüzdeniz : 100 %

12.

Lightships are aids to navigation, similar in function to lighthouses. They came into use in the 17th century in places where it was not practical to build a lighthouse. Modern lightships are steel vessels about 35 metres long ………… . Some lightships, however, those equipped with automatic devices, require no full time crew on board.

They are most suitable for sheltered waters where high-powered illumination is not necessary

Usually they are manned by a crew of about seven, and carry all the equipment standard to a lighthouse

Because lightships are often located in remote places, the power used to operate them is usually derived from diesel generators

To increase light intensity and focus it into a beam, mirrors and other reflectors came into use in the 18th century

Modern lighthouses have reflectors, as well as lenses and prisms, to carry the light farther

Yorum yazmak için üye olmalısınız.

Kayıt Yap \| Giriş	Ana Sayfam Yap Sitene Ekle	İletişim Ana Sayfa

Kullanıcı Adı: Şifre: Beni Hatırla
Şifremi Unuttum Kayıt Yap